metsulfuron (Escort and others)
Rate Escort: 0.3 oz ai/A (0.5 oz/A)
Time Apply to actively growing plants.
Remarks Using a nonionic or silicone surfactant increases effectiveness. Application sites differ between products, see label.
Caution Apply only to pasture, rangeland, and non-crop sites.
Site of action Group 2: acetolactate synthase (ALS) inhibitor
Chemical family Sulfonylurea
picloram (Tordon)
Rate 0.25 lb ae/A
Time Apply from early bud to bloom. Plants should be actively growing at the time of application.
Remarks Plants are poisonous to livestock. To be used on rangeland or permanent grass pastures.
Caution Most formulations are restricted-use herbicides. Do not graze until plants dry up after application. Avoid drift to sensitive crops. Do not contaminate water. Potatoes, beans, and many other broadleaf crops are sensitive to these herbicides. Do not use picloram in diversified crop areas.
Site of action Group 4: synthetic auxin
Chemical family Pyridine